sh: dma: Make PVR2 DMA configurable.

With arch/sh/drivers/dma/ always being built, the Dreamcast DMA engines
are being unconditionally built in, regardless of whether the DMA API is
enabled or not. This is a regression from previous behaviour, but there
is not much advantage in building them all in unconditionally regardless.
Add a new config option to make it optional, and update the only user of
it to reflect that.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 15 insertions, 1 deletions

diff --git a/arch/sh/drivers/dma/Kconfig b/arch/sh/drivers/dma/Kconfig
index 32bb8fa605c2..ae26610837b2 100644
--- a/arch/sh/drivers/dma/Kconfig
+++ b/arch/sh/drivers/dma/Kconfig
@@ -54,4 +54,17 @@ config SH_DMABRG
           of the SH7760.
           Say Y if you want to use Audio/USB DMA on your SH7760 board.
 
+config PVR2_DMA
+        tristate "PowerVR 2 DMAC support"
+        depends on SH_DREAMCAST && SH_DMA
+        help
+          Selecting this will enable support for the PVR2 DMA controller.
+          As this chains off of the on-chip DMAC, that must also be
+          enabled by default.
+
+          This is primarily used by the pvr2fb framebuffer driver for
+          certain optimizations, but is not necessary for functionality.
+
+          If in doubt, say N.
+
 endmenu
diff --git a/arch/sh/drivers/dma/Makefile b/arch/sh/drivers/dma/Makefile
index ab956adacb47..cff52cb6ac71 100644
--- a/arch/sh/drivers/dma/Makefile
+++ b/arch/sh/drivers/dma/Makefile
@@ -4,5 +4,6 @@
 
 obj-$(CONFIG_SH_DMA_API)        += dma-api.o dma-sysfs.o
 obj-$(CONFIG_SH_DMA)            += dma-sh.o
-obj-$(CONFIG_SH_DREAMCAST)      += dma-pvr2.o dma-g2.o
+obj-$(CONFIG_SH_DREAMCAST)      += dma-g2.o
+obj-$(CONFIG_PVR2_DMA)          += dma-pvr2.o
 obj-$(CONFIG_SH_DMABRG)         += dmabrg.o